WebP to MP4 Converter

Animated WebP stickers and web animations cannot be uploaded to most social networks, video editors or messengers that expect a video file. This converter turns them into an H.264 MP4 that plays everywhere. The browser decodes every WebP frame with its own image decoder (the video engine cannot read animated WebP), each frame keeps its display time on the video's frame grid, and transparent areas are filled with the colour you choose. Repeat a short sticker a few times to make a clip long enough to post. Nothing is uploaded.

How to use this tool

1. Choose one or more animated WebP files.
2. Set how many times the animation should play, the frame rate and, if needed, a maximum width.
3. Pick a background colour for transparent areas (white by default).
4. Download the MP4; the first frame is shown as a check.

Formula

Video length = sum of the WebP frame durations × number of plays

Frames are drawn onto the background colour at the chosen size (even width and height, which H.264 needs) and encoded with x264 at CRF 20. Each WebP frame is repeated for as many video frames as its duration covers, so every frame starts within half a video frame of its exact time (within 1/120 s at 60 fps). A still WebP is shown for 3 seconds per play.

Example

A sticker of 24 frames at 40 ms lasts 24 × 0.04 = 0.96 s. With 5 plays the MP4 is 4.8 s long; at 30 fps that is 144 video frames, each WebP frame filling about 1.2 video frames.